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<br />uted uniformly throughout the study area. Although most of the wells have increases in water levels some have
<br />
<br />ttecreases in water levels. Wells that have significant decreases in water levels generally have records that end
<br />
<br />before the 1980's or have records for only a few years. The hydrographs in figure 4 indicate a prominent period of
<br />
<br />water-level increases that begins about 1980 that is common to wells that have record for this period. Because
<br />
<br />wells that have decreases in water levels are missing periods of prominent increases or represent only a small part
<br />
<br />of the period studied, excluding them from a characterization of general trends for water levels in the study area is
<br />
<br />reasonable. However, they do indicate that the phenomenon of water-level increases in theiirt<\y area has a
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<br />temporal element to it and that there can be short-term deviations from the general Iotlgiie'rih trendfof w:ater':level
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<br />The hydrographs in figure 4 are developed from reIalive~Y-l~)re<:.9f~~i'1I:>:~ich the wells were measured
<br />,c ,f"" ~'"_ ""r" "'" ',,,, _
<br />&stematically, usually in the spring and fall of each YeaJ:\~(ll1i6im~'f~~~i\;;ral, the deepest depths to water
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<br />
<br />are measured in the fall and the shallowest in the~l>1\rig. f~{a~en~?f ti~e such as used in this study, about 35
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<br />years, measurements of ground-water Iev~~~~~~~:s,p~nia~~~I probably do a reasonable job a characterizing
<br />
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<br />the extremes of ground-water level ~~ctilllt'PIJS': /.. -'\
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<br />The range in water-leveI~~as~~~t(~t-l~l'1o/idiial wells is included in table 3. The mean of the ranges is
<br />'- '<>,') \\\::-:_/://}~:~~,_~\:~-'-'~'>>i-
<br />6.24 feet, indicating that-mi/iy we 'Us inZt,pe'stlldfarea have water-level fluctuations of that magnitude. The range
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<br />reported here is neariytwice ihe'!'llpge,rep\Jrted by Konikow and Bredehoeft in (1974). The difference between
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<br />these two reported rangesJl?f1e~ts:th~reIativeIy robust nature of the data used for the study described in this report,
<br />
<br />increases.
<br />
<br />Fluctuations in Water Levels
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<br />which covers a period of~ec~des: compared to the Konikow and Bredehoeft (1974) study for which only 1 year of
<br />
<br />data was available.
<br />
<br />To determine if the measured ranges have a distinctive spatial pattern, they were plotted on a map. The
<br />
<br />mapped ranges seemed to visually indicate a tendency for ranges to be small near the Arkansas River and to
<br />
<br />ttncrease away from the river. However, closer examination indicated that, although fluctuations greater than 10
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<br />8
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